Chemical compositions and method for degassing of processing equipment
a technology of processing equipment and compositions, applied in the direction of detergent compounding agents, cleaning using liquids, separation processes, etc., can solve the problems of hazardous vapors, volatile residual liquid hydrocarbons, harmful passages for workers, etc., and achieve the effect of prolonging the degassing tim
Active Publication Date: 2019-10-03
FQE CHEM INC
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Problems solved by technology
The vessel must first be decontaminated of any residual materials in it, which may render the vessel harmful for workers to enter.
The bottom section is typically very difficult to dean since heavier chemicals tend to settle and accumulate in this area.
Otherwise, residual liquid hydrocarbons volitalize and become the source of continued evolution of hazardous vapors.
Without the removal of the residual hydrocarbon liquids, otherwise known as degreasing, the decontamination process often would require long periods of time, days even, before the equipment could be authorized for safe entry.
While simple and relatively inexpensive, the cleaning performance of high-pressure steam is very poor.
Although these organic solvents may satisfactorily remove oils, they do not have the solvency strength necessary to thoroughly clean the vessels while in a liquid phase.
Since organics by nature are not water soluble, rinsing with water is time-consuming, inefficient, and very difficult.
Additionally, it is extremely difficult to determine whether these potentially harmful organics have been completely removed by the rinse process.
As well as being expensive this operation may considerably lengthen degassing times. In fact, inertisation requires the prior sealing of all the gaskets of the tank, including the legs supporting the mobile roof.
Method used
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[0028]The description that follows and the embodiments described therein are provided by way of illustration of an example, or examples, of particular embodiments of the principles of various aspects of the present invention. These examples are provided for the purposes of explanation, and not of limitation, of those principles and of the invention in its various aspects.
[0029]The present invention relates to improvements in the degassing of process equipment and vessels to decontaminate them to allow for human entry, by use of chemical compositions designed to enhance the removal of residual hydrocarbon liquids. The present composition can be applied in a carrier medium wherein the carrier medium can be in either the vapour or liquid phases.
[0030]The present inventors have discovered that a combination of an oxyalkylated thiol and a substituted 9-decenamide when injected with steam or liquid, produce exemplary performance in degreasing typical processing equipment and thereby signi...
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Abstract
A chemical composition for use in degassing of vessels is taught, said chemical composition including 1-10% by weight of an oxyalkylated dodecyl thiol; and 1-20% by weight of an alkyl di-substituted 9-decenamide. A method is further provided for degassing a vessel. The method includes charging said vessel with chemical composition and a carrier medium, wherein said chemical composition comprises 1-10% by weight of an oxyalkylated dodecyl thiol and 1-20% by weight of an alkyl di-substituted 9-decenamide.
Description
FIELD OF THE INVENTION[0001]The present invention relates to chemical cleaning compositions and methods for removing fouling in the form of hazardous vapors and residual hydrocarbon liquids from petroleum refining, chemical, petrochemical and manufacturing processing equipment.BACKGROUND OF THE INVENTION[0002]In the many chemical industries, maintenance and capital improvements occur on a scheduled basis. Operating units including various types of vessels from tanks to towers to heat exchangers to distillation columns and other types of equipment are maintained as part of an effort called a turn-around.[0003]During a turn-around, an operating process vessel cannot be merely shutdown and drained before personnel entry for maintenance. The vessel must first be decontaminated of any residual materials in it, which may render the vessel harmful for workers to enter.[0004]During a turnaround, and before internal mechanical maintenance is performed of any kind, a cleaning must take place ...
Claims
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IPC IPC(8): C11D11/00B08B3/08B01D53/14C11D3/32C11D3/34C11D3/20C11D3/30C11D1/72
CPCB08B3/08C11D3/2068C11D3/32C11D3/30C11D11/0041C11D1/72C11D3/3427B01D53/14B01D53/1487B01D53/1493B01D53/72B01D2252/2026B01D2252/20484B01D2252/20489B01D2252/2053B01D2252/2056B01D2252/60B01D2257/702C11D3/33C11D7/3218C11D7/34C11D7/3263
InventorMASON, DOUGLAS J.
OwnerFQE CHEM INC